I Became the Contract Mother of the Grim Reaper Duke's Family, and They Became Obsessed With Me

I Became the Contract Mother of the Grim Reaper's Household, and He Got Way Too Obsessed With Me, Shinigami Koushakuka no Heiyaku Haha ni Nattara Shuushaku Saresugimashita, The Grim Reaper Duke's Obsessive Contract Mother, 死神公爵家の契約母になったら執着されすぎました